Twenty-one years ago today, a group of interns walked into the fictional Seattle Grace Hospital to begin their surgical careers. It was the start of the longest-running scripted prime-time drama on US television network ABC, with the show, Grey's Anatomy, clocking up 22 seasons so far with no end in sight. Along the way the show has earned numerous award nominations and won the 2007 Golden Globe for best drama. It is now the longest-running medical drama in US TV history. Celebrating 20 years of the show last year, co-creator Shonda Rhimes wrote that at the time Grey's Anatomy launched,...